[Bug target/79712] Clang smarter about unrolling in fhourstones benchmark

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79712

--- Comment #4 from PeteVine <tulipawn at gmail dot com> ---
It's a gcc version 7.0.1 20170220 (experimental) (GCC) configured with:

--enable-languages=c,c++,fortran --prefix=/usr/gcc7 --program-suffix=-7
--enable-shared --enable-linker-build-id --libexecdir=/usr/gcc7/lib
--without-included-gettext --enable-threads=posix --libdir=/usr/gcc7/lib
--enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-libquadmath --enable-plugin --with-system-zlib
--disable-browser-plugin --with-arch-directory=aarch64 --enable-multiarch
--enable-fix-cortex-a53-843419 --disable-werror --build=aarch64-linux-gnu
--host=aarch64-linux-gnu --target=aarch64-linux-gnu --enable-checking=release